After 100+ games of BL last season, I feel as if I got a fairly complete overview of the powerful decks in BL. For what it's worth, here's a small portion of what I saw happening last season.
1) Prevalence of Mono-Light as a counter to Firestall + rushes
Without a doubt one of the biggest creations in BL season 1/2012, popularized by regen2k9. Highly customizable, the basic combination of SoD + Miracle as a backbone of a mono-light stall worked excellently to avoid the OTK capacities of Firestall and some other OTK decks while being able to survive against even the most powerful of rushes. The power of this deck lead to a shift in the meta, leading towards...
2) An influx of denial
My last round against regen2k9 last BL was discake vs DBH. Twice. Denial was the key to keeping mono-light at bay, preventing it from setting up a powerful defense. As a result, Discord/EQ and Discord/BH decks rose in power, and some Mono-Lights began to run Sanctuaries instead of SoSacs (not many though - SoSacs were still key to dealing with rushes that rose in power over time, such as antabows).
3) The power of Timestall
My own personal creation, a low-quanta time/light stall managed to keep much of the stalling capacity of mono-light while also being able to defeat mono-light. Reverse Time and Eternity worked wonders against immobows and grabbows, and these combined with Sundials and Procrastinations gave time to set up Sanctuaries and SoDs combined with Miracles to outstall the opponent.
4) Shards in the meta
Shards really weren't used that much in the meta. SoD and SoSac were used in Mono-Light, SoD was used in my Time/Light stall, and SoG was used in SoG Firestall. One person ran a Zen-type deck once, but Zen isn't very effective unupped. That was pretty much it, however. SoR-Pharoahs were too slow, unupped Instosis was generally inferior to a standard dragonbow OTK, SoSe was just not very powerful unupped and SoPa was useless up until the very end of the season. While SoSac could be used in mono-death, Bone Wall generally served the same purpose while providing a better defense.
Overall, stalls held great strength mainly due to the power of SoD to act as a short-term heal as well as hold synergy with Miracle and SoSac. Also, if you have something to say, please, feel free to add more to this. Mostly, I wanted to just start a discussion with what was bouncing around in my brain. Also, I would ask that you please not use this section to post deck codes - this is meant to be a meta discussion of BL 1/2012, and not a sounding board for deck ideas or a place to post former league decks. Thanks.
